-LRB- CNN -RRB- -- Colombian President Juan Manuel Santos was at home Saturday after leaving a hospital where he underwent surgery for prostate cancer this week .

`` A million thanks to everyone for their support and solidarity , '' the president wrote on his official Twitter page .

On Monday , Santos announced that he had prostate cancer , but described the tumor as `` small '' and `` not aggressive . '' He underwent surgery Wednesday at a hospital in Bogota , Colombia 's capital .

Upon leaving the hospital , Santos spoke to reporters , according to CNN affiliate Caracol .

The 61-year-old president said the tumor had not metastasized .

`` In other words , I 'm totally cured , '' Santos said .

The news comes about one week before the government is expected to start peace talks with the Revolutionary Armed Forces of Colombia , commonly known as the FARC .

Talks to end the nearly 50-year war are set to begin in Oslo , Norway , on October 14 , Caracol reported . They had previously been scheduled to start Monday .

Recently , doctors have diagnosed several current and former South American leaders with cancer .

Venezuelan President Hugo Chavez first announced his diagnosis last year , though neither he nor anyone in his government has specified the type of cancer .

Brazilian President Dilma Rousseff overcame cancer while she was a candidate for the office , and former Brazilian President Luiz Inacio Lula da Silva underwent treatment for throat cancer .

Then-Paraguayan President Fernando Lugo was diagnosed with non-Hodgkin 's lymphoma in 2010 , while Argentinian President Cristina Fernandez de Kirchner was treated for thyroid cancer this year .

@highlight

`` I 'm totally cured , '' says Colombian President Juan Manuel Santos

@highlight

He says the tumor had not metastasized , thanks his supporters

@highlight

Doctors have diagnosed several current and former South American leaders with cancer